Peristaltic pump pistol

ABSTRACT

The peristaltic pump streaming/spraying pistol comprises a shroud with a battery, a motor, and a hose. The hose is connected with a sinking weighted ball at one end and a streaming/spraying nozzle at another end. A wall and a rotating disc, which is at least partially surrounded by the wall, are inside the shroud. Equidistant rollers for pressing the hose are mounted on the rotating disc. Between the rollers and the wall, there is a pressing channel for the hose. When in use, the battery starts the motor to drive the rotating disc. At the same time, the rollers on the rotating disc continuously press the hose and rapidly extrude the air out of it, so that a negative pressure is created in the hose. Due to the atmospheric pressure, the liquid will enter the hose from sinking weighted ball and will stream/spray out from the discharge nozzle.

FIELD OF THE INVENTION

The invention relates to spraying apparatuses, and particularly to aperistaltic pump streaming/spraying pistol.

BACKGROUND OF THE INVENTION

As is well known, spraying agricultural chemicals plays an importantrole in agricultural production because it assists with the harvestingof farm crops. However, agricultural chemicals are highly poisonous, andthus, people generally use spraying apparatuses to spray agriculturalchemicals over the farm crops.

In daily life, spraying apparatuses are also used to spray chemicalliquids for home cleaning, sterilization, removing mildew, etc.Traditional spraying apparatuses are hand-operated and not convenient touse. Moreover, users can easily become tired after a long periods ofoperation.

At present, commonly-used spraying apparatuses are mainly gear-pumppistol or piston-pump pistol devices. These two pistols have thefollowing disadvantages:

(1) If the gear-pump pistol is used to pump the chemical liquid, itsservice life will be very short because of the strong corrosiveproperties of the chemical liquid. When strong corrosive chemicalliquids are sucked into the gear pump, the chemical liquid may easilyflush away the grease which is inside the gear pump for sealing andlubrication, resulting in the gear pump not working.

(2) If the single directional piston-pump pistol is used to pump thechemical liquid, it operates with low efficiency and high energyconsumption, it is difficult to produce and assemble, and it isexpensive.

BRIEF SUMMARY OF THE INVENTION

A peristaltic pump streaming/spraying pistol, which is of highefficiency and protects itself well from strong corrosive chemicalliquids, is provided.

The invention may comprise a peristaltic pump streaming/spraying pistolhaving a shroud in which there is a battery, a motor, and a hose. Oneend of the hose is connected with a sinking weighted ball while theother end is equipped with a streaming/spraying nozzle. Inside theshroud, there is a wall and also a rotating disc which is driven by themotor. The rotating disc is at least partially surrounded by the wall. Aplurality of equidistant rollers for pressing the hose are mounted onthe rotating disc. Between the rollers and the wall, there is a pressingchannel in which the hose is placed.

When in use, the battery starts the motor to rotate the rotating disc ata high speed. At the same time, the rollers on the rotating disccontinuously press the hose and rapidly extrude the air out of it sothat a negative pressure is created in the hose. Due to the atmosphericpressure, the liquid is sucked into the hose from the sinking weightedball and is streamed/sprayed out from the nozzle, thus realizing the aimof the peristaltic-pump pistol being used for pumping andstreaming/spraying liquid. When the rotating disc stops, the rollers canfunction similar to a check valve by pressing the hose tightly toprevent the liquid from flowing back. Thus, unlike existing technology,there is no need to mount a check valve on the hose.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of a peristaltic pumpstreaming/spraying pistol;

FIG. 2 is a schematic drawing of gear box connection between the motorand the rotating disc for the peristaltic pump streaming/spraying pistolshown in FIG. 1;

FIG. 3 is a schematic drawing of the connection between the motor, therotating disc, and the hose for the peristaltic pump streaming/sprayingpistol shown in FIG. 1;

FIG. 4 is a schematic drawing similar to FIG. 3 with the hose removed;

FIG. 5 is a schematic drawing similar to FIG. 3 with the top coverremoved from the motor; and

FIG. 6 is a schematic drawing of the cover plate for the rotating discshown in FIG. 3.

DETAILED DESCRIPTION OF THE INVENTION

In order to explain the aim and technical design and advantage of theinvention, a detailed description referencing the attached drawings asexamples is provided herein. The following representative examples areused for describing the invention, but the invention should not belimited to these specific examples.

As shown in FIGS. 1 to 6, the invention provides a peristaltic pumpstreaming/spraying pistol comprising a shroud 1 with a battery 2, amotor 3, and a hose 4, all at least partially disposed therein. One endof hose 4 is connected to a sinking weighted ball 5 while the other endis equipped with streaming/spraying nozzle 6. Inside the shroud 1, thereis a wall 7 and a rotating disc 8, which is driven by the motor 3. Therotating disc 8 is at least partially surrounded by the wall 7.Equidistant rollers 81, which can press the hose 4, are mounted on therotating disc 8. Between the rollers 81 and the wall 7, there is apressing channel 71 in which hose 4 is placed. To use the pistol, thetrigger 9, which is connected with battery 2, is pressed. The battery 2will start the motor 3, which drives the rotating disc 8 to rotate at ahigh speed. At the same time, the rollers 81 on the rotating disc 8continuously press the hose 4 and rapidly extrude the air out of it, sothat a negative pressure is created in the hose 4. Due to theatmospheric pressure, the liquid will be sucked into the hose 4 from thesinking weighted ball 5 and will stream/spray out from the nozzle 6,thus realizing the aim that the peristaltic-pump pistol is used forpumping liquid and streaming/spraying it. When the rotating disc 8stops, the rollers 81 can function similar to a check valve by pressingthe hose 4 tightly to prevent the liquid from flowing back. Thus, unlikethe existing technology, there is no need to mount a check valve on thehose 4.

Detailed descriptions for certain component parts of the inventionfollow below.

As shown in FIG. 1, the shroud 1 comprises an upper shroud 11 and alower shroud 12. The battery 2, motor 3, hose 4, streaming/sprayingnozzle 6, wall 7, rotating disc 8, and trigger 9 are all mounted insidethe lower shroud 12, which combines with the upper shroud 11 to form aperistaltic pump streaming/spraying pistol.

As shown in FIG. 2, the motor 3 drives the rotating disc 8 through agear box 10 which is connected as follows: the shaft of the motor 3 isequipped with small gear 101 which matches with large gear 102 anddrives it. Large gear 102 and small gear 103 are mounted on the sameshaft. Small gear 103 drives large gear 104 which is mounted on the sameshaft with rotating disc 8. Thus, rotating disc 8 will turn with largegear 104. By means of the gear box 10, the motor 3 can drive rotatingdisc 8 with a steady torque, and the rotary speed of the rotating disc 8can be easily controlled.

As shown in FIGS. 3 to 6, the rotating disc 8 is mounted on a horizontalbase 82, which is installed on lower cover 12. In this example, thereare three rollers 81 on the rotating disc 8. In addition, a plurality ofequidistant flange bulges 83 are mounted on the rotating disc 8. Therotating disc 8 connects to the cover plate 84, which has a lowersurface equipped with several equidistant flange bulges 841, whichoppose the flange bulges 83 on rotating disc 8. When the rotating disc 8is operating, both flange bulges 841 and 83 can open and prepare thehose 4 for contact with the roller 81, so as to prevent that portion ofthe hose 4 from remaining stuck together by the roller 81. If theperistaltic-pump pistol is operated after not being in use for a longtime, the hose 4 may be stuck together because there is liquid left inhose 4. Both flange bulges 841 and 83 can work together to open andprepare the hose 4 for the roller 81, so as to prevent the hose 4 frombeing substantially stuck together and thus, blocked.

The peristaltic-pump streaming/spraying pistol is mainly used forpumping and dispensing a chemical liquid with corrosive properties. Inorder to prevent the hose 4 from being damaged due to corrosion causedby a chemical liquid, the hose 4 can be made of silicon.

As shown in FIG. 1, the nozzle 6 can rotate in the shroud 1, so that thechemical liquid can be streamed or sprayed out to reach a large area ofcoverage.

Referring to FIG. 1 again, the sinking weighted ball 5 may comprise aplastic outer casing and a ceramic ball inside. One end of the plasticouter casing is equipped with a liquid intake 51 while the other end isconnected with the hose 4. The ceramic ball inside the plastic outercasing can ensure that the sinking weighted ball 5 immerses itself inthe liquid completely with the help of gravity so that the peristalticpump pistol can reliably pump the liquid.

The above-mentioned description is only a representative example of theinvention without exerting any limit on the invention. Any modification,equivalent change and improvement, etc. made according to the spirit andprinciple of the invention shall be encompassed by the invention.

The use of the terms “a” and “an” and “the” and similar referents in thecontext of describing the invention (especially in the context of thefollowing claims) are to be construed to cover both the singular and theplural, unless otherwise indicated herein or clearly contradicted bycontext. The terms “comprising,” “having,” “including,” and “containing”are to be construed as open-ended terms (i.e., meaning “including, butnot limited to,”) unless otherwise noted. Recitation of ranges of valuesherein are merely intended to serve as a shorthand method of referringindividually to each separate value falling within the range, unlessotherwise indicated herein, and each separate value is incorporated intothe specification as if it were individually recited herein. All methodsdescribed herein can be performed in any suitable order unless otherwiseindicated herein or otherwise clearly contradicted by context. The useof any and all examples, or exemplary language (e.g., “such as”)provided herein, is intended merely to better illuminate the inventionand does not pose a limitation on the scope of the invention unlessotherwise claimed. No language in the specification should be construedas indicating any non-claimed element as essential to the practice ofthe invention.

Preferred embodiments of this invention are described herein, includingthe best mode known to the inventors for carrying out the invention.Variations of those preferred embodiments may become apparent to thoseof ordinary skill in the art upon reading the foregoing description. Theinventors expect skilled artisans to employ such variations asappropriate, and the inventors intend for the invention to be practicedotherwise than as specifically described herein. Accordingly, thisinvention includes all modifications and equivalents of the subjectmatter recited in the claims appended hereto as permitted by applicablelaw. Moreover, any combination of the above-described elements in allpossible variations thereof is encompassed by the invention unlessotherwise indicated herein or otherwise clearly contradicted by context.

1. A peristaltic pump pistol comprising: a shroud at least partiallyenclosing a battery, a motor, and a hose; a first end of the hose isconnected to a weighted ball while a second end of the hose is connectedto a nozzle; a wall and a rotating disc are disposed inside the shroud,the rotating disc is at least partially surrounded by the wall and isdriven by the motor; a plurality of equidistant rollers for compressingthe hose are mounted on the rotating disc; a pressing channel isdisposed between the rollers and the wall, and the hose is disposedwithin the pressing channel.
 2. The peristaltic pump pistol of claim 1wherein the motor is mounted outside the wall.
 3. The peristaltic pumppistol of claim 2 wherein the motor drives the rotating disc with a gearbox.
 4. The peristaltic pump pistol of claim 1 further comprising aplurality of equidistant rotating disc flange bulges mounted on therotating disc.
 5. The peristaltic pump pistol of claim 4 wherein therotating disc is coupled to a cover plate, the cover plate including aplurality of equidistant cover plate flange bulges opposing the rotatingdisc flange bulges.
 6. The peristaltic pump pistol of claim 1 whereinthe hose is a silicon tube.
 7. The peristaltic pump pistol of claim 1wherein the nozzle is rotatable with respect to the shroud to switchbetween a streaming and a spraying position.
 8. The peristaltic pumppistol of claim 1 wherein the weighted ball includes a plastic outercasing and a ceramic ball disposed within the plastic outer casing, theplastic outer casing includes a water intake and is connected to thehose.